当△FIRR（或△EIRR）（）is或（ic）时，以投资额小的方案为优。
A.大于
B.小于
C.大于或等于
D.等于
参考答案：B
避免爆胎的唯一方法是经常进行轮胎换位。
Directions:
Study the following picture carefully and write an essay entitled "Noise Pollution. "
In the essay you should
(1) show your understanding about the issue,
(2) state your opinions and use facts to support your statement.
